The term 'pyinstaller' is not recognized as the name of a cmdlet, function, script file, or operable program.

 Pyinstaller error :- 

pyinstaller : The term 'pyinstaller' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the

spelling of the name, or if a path was included, verify that the path is correct and try again.

At line:1 char:1

+ pyinstaller --onefile test.py

+ ~~~~~~~~~~~

    + CategoryInfo          : ObjectNotFound: (pyinstaller:String) [], CommandNotFoundException

    + FullyQualifiedErrorId : CommandNotFoundException

Solution :- 

1. Pip uninstall pyinstaller

2. Python -m install pyinstaller

3. Python -m PyInstaller file.py